Remarkable for style, comfort, and support, Sift guest chairs have all-mesh seats and backs made from SoSoft mesh - a breathable, supple, and incredibly soft woven material. The constant cooling effect of Sift's mesh ventilation promotes a more comfortable and productive work day. SoSoft mesh has a 10-year warranty and passes KI's rigorous testing for bursting, tearing, and cleanability. The built-in lumbar mechanism (rare in a guest chair) offers enhanced comfort and constant support. The mechanism adjusts easily from a sitting position. Sift guest chair has an integral cantilevered arm and provides design continuity when used with Sift task chair.